The main difference between our Regrind Rolls and our 1/2" Mega Rubber Rolls is that the Regrind Rolls are made from the scrap material from our standard rubber lines. Our 1/2" Mega Rubber Rolls are a mainline product. With our Regrind Rolls, we offer two colors, confetti and black. The confetti color is actually harder than our mainline product, which means it is more durable. In contrast, the black color is less dense, providing a great floor for high-impact workouts, ensuring that your joints are better protected when working out. Other than those differences, they are made from the same material, recycled commercial truck tire treads.